Bump mods/default from f203897 to d4bb8ad

Bumps [mods/default](https://github.com/minetest-game/default) from `f203897` to `d4bb8ad`.
- [Commits](minetest-game/default@f203897...d4bb8ad)

---
updated-dependencies:
- dependency-name: mods/default
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>